1.)a molecule ef4 has seesaw molecular geometry. what is the identity of the element e?

rn
se
i
f
ar

2.)the bond angles in h2o2 are approximately:

90°
105°
109.5°
120°
180°

3.)which of the following molecules is non-polar?

xef2
sef4
brf3
so2
icl5

4.)what are the hybridizations of the 4 carbon atoms on the molecule below (numbered from left to right)?

c1 c2 c3 c4
a. sp3 sp3 sp2 sp3
b. sp3 sp sp sp3
c. sp3 sp3 sp3 sp3
d. sp2 sp sp sp2
e. sp3 sp2 sp2 sp3

need explaining